I had these installed in my flat about eight years ago. Every year they charge later and later. They start now at 4am and continue until about 9.30am. This means I am not using the off peak electricity properly.
How do you change the timing?
Many thanks
Treeman1

An electrician cannot do it. The clock is sealed and it is a capital offence to break the seals.
Scottish Power take your money, they should fix it. Try the phone first, if no resolution then write a formal letter. I have heard that a letter gets better priority.

PS. Please turn off the Caps lock on your keyboard. Typing in capitals is considered as SHOUTING, and is rude according to Internet etiquette.